Flow boiling experiments are conducted in oblique-finned microchannels with different oblique angles to investigate its effects on two-phase heat transfer, pressure drop and instabilities. These studies are carried out with FC-72 dielectric fluid at three different oblique angles of 10 degrees, 30 degrees and 50 degrees. Three mass fluxes ranging from 194 kg/m(2) s to 386 kg/m(2) s, and effective heat fluxes from 14.9 W/cm(2) to 70.0 W/cm(2) are tested with high-speed flow visualisations to explore the physical boiling phenomenon in the microchannels. Results show that heat transfer performance increases with oblique angles from 10 degrees to 50 degrees due to the increase in secondary channels which promote flow mixing. This causes an increase in pressure drop from 10 degrees to 30 degrees oblique angles due to the increase in flow separation and flow diversion. Pressure drop, however, is almost negligible when the oblique angles are increased from 30 degrees to 50 degrees. As a result, the 50 degrees oblique-finned microchannels presents an attractive option for further parametric studies. (C) 2016 Elsevier Ltd. All rights reserved.